Remote control system



July 14, 1931. c. REMINGTON 9 REMOTE CONTROL SYSTEM Original Filed Feb. 6 1926 6 Sheets-Sheet l --rIm.rEnIuP"' Eharla's Eemm 1cm c. REMINGTON REMOTE CONTROL SYSTEM e Sheets-Shet 2 FOLARIZED (l I [fl WI Eharlss EB K 0\ k a m )L W m OriginalFiled Feb. 6, 1926 POLAR/ZED F v v 1 1 /1 6 July 14, 1931. c. REMINGTON 1,814,529

- REMOTE CONTROL SYSTEM Original Filed Feb 6, 1926 e Sheets- Sheet 5' Eluarles EE'm' u'TTF 7 M 577? July 14, 1931. c. REMINGTON 1,814,529 REMOTE CONTROL SYSTEM Original Ffiled Feb. 6, 1926 6 Sheets-Sheet 4 o q a a g o a Cl BRE/l KER A/O/ co a POLAR/zip 9 IriLrEnIuP Eharlas Ramzn Zu'n' flWHW July 14, 1931..

Original Filed'Feb. 6, 1926 C. REMINGTON REMOTE CONTROL SYSTEM 6 Sheets-Sheet 5 ImrsnZuP ljhazll'jjggglun c. REMINGTON REMOTE CONTROL SYSTEM 6 Sheets-Sheet 6 Original Filed Feb. 6, 192

Ann lllil CIRCUIT Inuen UP Charles FEmm Tam July 14, 1931.

Patented July 14, 1931 UNITED STATES PATENT OFFICE CHARLES REMINGTON, OF LIVERPOOL, ENGLAND, ASSIGNOR, BY MESNE ASSIGNMENTS,

- TOAUTOMATIC ELECTRIC INQ, OF CHICAGO, ILLINOIS, A CORPORATION OF DELA- WARE original application filed February 6, 1926, Serial No. 86,383, and. in Great Britain February 13, 1925.

Divided and this application filed -The present invention concerns improvements in or relating to remote control systems. More particularly the invention relates to remote control of substations from a main or central station and includes means for selecting the device (circuit breaker or the like) to be operated. for obtaining a signal that the correct device has been selected, for operating the device and for also'receiving a signal that the operation has been performed correctly. In addition means are provided for signaling the control station whenever a circuit breaker or similar automatic operation takes place at the substation.

One of the features of the present inven- 'tion is an arrangement by which when the operation of indicating the position of circuit breakers is initiated, the position of all the circuit breakers is indicated either automatically on a circuit breaker coming out, or under the control of the attendant at the cont-r01 station.

One form of the invention will be described by way of example with reference to the accompanying drawings. These drawing are identical with those in copending application Serial No. 86383, filed February 6. 1926,.of which application the present application is a division. The drawings are also similar to the drawings of application, Serial No. 86,417. filed February 6, 1926, with the addition of new figures showing the detailsof the new features contained in the present case. IVhile the example illustrated refers to a direct connection between a central station and a control station, the invention can be modified as will be readily understood by those versed in the art.

In the drawings Figs. 1 and 2 represent the apparatus at the central station, the apparatus shown in Fig. 2 being responsive to signals received from the substation while the apparatus shown in Fig. 1 is that used for controlling the apparatus at the substation,

May 15, 1926. Serial No. 109,325.

shown in Fig. 4 illustrates the apparatus which responds to the selective action at the central station and serves to select the circuit breaker to be connected up or the allied circuit connection to be established as desired by the attendant-at the control station. The apparatus shown in 3 is that which responds to the coming out of the circuit breaker to give a signal to the control station and to indicate the position of the various circuit breakers.

Figs. 5 and 6 show an arrangement alternative to that in Figs. 3 and 4. In reading the drawings Fig. 1 should be placed at the the supervisory relays individual to the varlous switchlngdences. This commutatorv is swept over by a brush controlled directly by the switching device, to control the sub station sender to cause it to supervise a I change in position of the device. The modification shown in these. figures also permits the substation sender to send supervisory signals to the control station, while the selecting switches are off normal, by releasing the trunk as soon as theetransmission of the selecting signal has been completed. These modifications will be best understood from a reading of the detailed specification which follows. The modifications shown in Figs. 5 and'6 consitute the subject matter of the claims of the instant application. The other -,features shown, are claimed in the' above mentioned copending applications.

A description will first be given of the operation by which according to the invention a circuit breaker-is put in at a substation under the control of the attendant at the control station. The apparatus shown is conveniently mounted on apanel. on which will be visible keys K1, K2, K3 and associated therewith lamps L1, LA, L2, LB, L3, L0. The number of keys will correspond with the number of circuit breakers with an additionalnumber according to the other operations it is desired to effect, such as the ea g f to close the upper contacts or the lower con-' tacts. Each of these movements corresponds to a different operation it is desired to effect, and the upward movement corresponds with putting a circuit breaker in, while the downward movement corresponds to pulling a circuit breaker out. For this reason the reference L followed by a numeral corresponds to the putting in of a circuit breaker, while L followed by a letter corresponds to the pulling of a circuit breaker out. Associated with each key are a pair of relays which are given the references R1 and RA and so on in a similar manner to L1, LA, so that the relays may be identified with the lamps with which they are associated. Assuming that it is desired to put circuit breaker No. 1 in, the key K1 is moved upwards, a circuit being completed for relay R1 as follows: positive pole of battery (represented by a plus sign within a circle throughout the drawings), relay R1, contact 10 of key K1, contact 16 of slow to release relay SR1 to negative pole of battery. At contact 22 key K1 closes a circuit as follows: negative pole of battery, contact 22, contact 22a, relay SR3, interrupter springs 23 of magnet M1 to positive pole of battery. Relay R1 energizes and effects the following circuit changes: at contact 11 it prepares a circuit for lamp L1, at contact 12 it connects positive pole of battery to the first contact 36 of rotary line switch RLSl. at contact 13 it completes a circuit for relay SR1 from positive pole of battery, relay SR1, contact 13 to negative pole of battery; at contact 14 it opens a point in the circuit of slow relay SR2, while at contact 15 it connects quick relay QRl across the conductors 17 and 18 as follows: conductor 17 contact 19 of quick relay QR2, contact 20 of slow relay SR3, relay QRl, contact 15 of relay R1 to conductor 18. Relay SR1 at contact 16 removes the short circuit about resistance RT, which however is of such a value that relay R1 receives enough current through this resistance to be maintained energized although it cannot be energized ini-' tially in this circuit; closes a point 21 in .the circuit of reLay SR2 and at contact 22a opens the circuit of relay SR3. Relay SR1 is made sufiiciently slow to pull up, however, to ensure that this circuit is not opened prior to the energization of relay SR3 in the circuit including contact 22 of key K1. Relay SR3 on energizing closes a circuit for the rotary magnet M1 of rotary line switch RLSl, at contact 24, while at contact 25 it connects negative pole of battery through contact 25, contact 19, conductor 17, contact 26. conductor17A (leading to substation), contact 27, conductor 17B, coritact 28, relays PR1 and QR3 in parallel, conductor 1813, contact 29, conductor 18A (leading back to control station), contact 30, conductor 18, contact 31 of relay QR2 to positive pole of battery. In this circuit relay QR3 energizes; with the current flowing in the direction described relay PR1 does not energize. QR3 brings about the following circuit changes: at contact 32 a circuit is completed from positive pole of battery, slow to release relay SR4 to negative pole of battery, at contact 33 a circuit is completed from positive pole of battery, contact 33, contact 34, magnet M3 of rotary line switch RLS3, negative pole of battery, while at contact 35 a circuit is completed from positive pole of battery, contact 35, magnet M2 of rotary line switch RLS2 to positive pole of battery. The rotary line switches RLSI, RLS2, RLS3, RLS4 are switches of the step by step type similar to those used in automatic telephone systems having a plurality of wipers adapted to be moved round in a continuously forward direction step by step over a bank of contacts by means of a ratchet mechanism. The WIP- ers move in a single plane and advance on the de-energization of the motor magnets.

A switch of this type is shown in Fig. 48, on page 51, of the second edition of the book Automatic Telephony by Smith and Campbell. It will thus be appreciated that the initial effect brought about by pressing the key K1 inan upward direction at the control station is to bring about the energization of relay SR4 and the magnets B12 and M3 at the substation. At the control station the slow acting relay SR3 is only slightly sluggish so as to ensure that it will not de-energize due to the opening of the interrupter contacts 23 by the magnet M1 before the magnets M2 and M3 at the substation have been properly energized. In other words SR3 is just rendered sufliciently sluggish to ensure that the impulses transmitted under thecontrol ofthe automatic'operation of the rotary line switch RLSl will not be too fast to properly and accurately control the operation of the rotary line switches RLS2, RLS3 andRLS4atthesubstation. Vhen relay SR3 falls back a short time after the energization of magnet M1 it opens the circuit of M1 which thereupon releases. At the same time it opens at contact 25 the circuit of relay QR3 which in turn opens the circuit of magnets M2 and M3. As a result the wipers of the switches RLSI, RLS3, RLS4 all advance one step with the result that the wiper VIA advances to the first .contact and thereupon a circuit iscompleted as follows: positive pole of battery, contact 12 of relay R1, first contact 36 in the bank of wiper W1A that wiper, quick relay QR2 to. negative pole of battery. QR2 energizes and opens contacts 19 and 31 and closes contacts 37 and 38, whereby the current over the conductors 17 and 18 is sent in the reverse direction. At the same time the wiper W1C advances on to the first bank contact which is multipled to all the other bank contacts and connected to the negative pole of battery, so that a circuit is completed for SR3 as follows: negative pole of battery, contact bank and Wiper W1C, relay SR3,

interrupter springs 23 which close when the magnet M1 de-energizes, to positive pole of battery. The reversal of battery over the leads 17 and 18 causes the relay QR3 to ener gize and this time also the relay PR1. The relay PR1 completes a circuit for the cut off relay CORl as follows: positive pole of battery, contact 39, right hand winding of relay COR'l to battery. Relay CORl energizes and at contact 40 completes the locking circuit for itself as follows: negative pole of battery, left hand winding of relay COR-1, contact 40, contact 41, contact 42, contact 43, to positive pole of battery, while it opens contact 34 and at contact 41a connects up the magnet M4 in place of the magnet M3 whose circuit was opened at 34. Consequently the relay QR3 in energizing this time completes a circuit for magnet M4. instead of magnet M3, the other operations are the same, the relay SR4 is arranged to be sufficiently slow that it will not release in between successive operations of relay QR3 during the series of impulses. The rotary line switch RLS3 therefore rests with its wipers on the first contact thereby giving an indication of the contact marked on the rotary line switch RLSI. As described the energization of relay SR3 closes at contact 24 the circuit for magnet M1 which again energizes and opens contact 23, whereupon the circuit of relay SR3 is opened and this relay de-energizes so permitting the magnet M1 to de-energize and the wipers WlA, VlB, W1C to pass to the second position. When this occurs the circuit of relay QR2 is opened at contact 36 and this relay de-energizes so-that on the next impulse the direction of current flowing over the conductors 17 and 18'will be in the same direction as that first described. Relay SR3 energizes again as soon as contact 23 closes in the circuit including wiper VVlC and the pulse thus sent over the conductors 17 and "18 causes the relay QR3 to pulse the magnet M2 and magnet M4. The transmission of impulses then occurs automatically in the manner justdescribed until the wiper VVlC reaches the normal position when no further circuit can be completed for the relay SR3. By this time assuming a bank of25 contacts, 25 impulses will, have been set over theconduct-ors 17 and 18. These 25 impulses will have operated the magnet M2 25 times so that the rotary line switch RLS2 will be, or should be in i s normal position. The rotary line switch RLS3 owing to the magnet M3 only having received one impulse will have its Wiper resting on the first contact, while the rotary line switch RLS4 having received the remaining 24 impulses will have 1ts wipers cm of Fig. 5.

contact 15, relay QRI, contact 20, contact 19,.

conductor 17, contact 26, conductor 17A, contact 27, conductor 17B, relay QR4 to negative pole of battery. In this circuit relays QRl and QR4 energize in series. Relay QR4 openscontact 28 and contact 46, closing contacts 41' and 106A. At contact 106A a circuit is completed for guard relay GRl which energizes so long as Q,R4 is energized, and by opening contacts 101, 104, prevents signals being transmitted in the opposite direction until the completion of the operation at the control station. Relay Q,R1 completes the following circuit: negative pole of battery,

contact 39 of relay QRl, lamp L1, contact 11 to positive pole of battery. Lamp L1 thereupon lightsthus signifying to the attendant at the control station that the three switches RLS2, RLS3 and RLS4 have operated correctly, i. e., RLS2 to make a complete revolution and RLS3 and RLS4 to set their wipers on contacts which are complementary to one another. This having been effected the attendant at the control station can now effect the putting in of the circuit breaker. To do this he presses the operating key OK which completes a circuit as follows: negative pole of battery, contacts of key OK, conductor 40, contact 41 of relay QR4, wiper W3A and the 1st contact engaged thereby to conductor 42 of a pair of conductors G1, which lead to an operating magnet by which the circuit breaker is put in. The other conductor 43 is connected over contact 44 to lead 18A and thence over contact 30, lead 18, contact 31 to positive pole of battery. A circuit breaker of this type is shown in the copending application of Nelson, Ser. No. 515,664, filed November 16, 1921, corresponding to French patent No. 560 020, for example the circuit breaker In applying this circuit breaker tovthe system of my invention, lead 42 would be connected to lead 117 of Nelson, and the battery connected to the magnet 341 of Nelson would be replaced by my lead 43.

Consequently. the operating magnet 3410f operate the key OK, but restore. the operated key, thereby releasing the relay R1 and openlay SR2, contact 21 of rela SR1 to negative pole of battery. Relay R2 momentarily opens contact 45 to open the circuit of the polarized relay PR2, the purpose of which is to keep open the circuit of this relay for a suflicient time to ensure that the apparatus has returned to normal. The de energization 'of relay QR4 in conjunction with'the deenergization of relay SR4 which has followed shortly after the relay QR3 stopped receiving impulses from the central station, causes a circuit to be completed as follows: negative pole of battery, contact 46, of relay QR4, contact 47 of relay SR4 and the following circuits in parallel: release relay RR4, wiper W4B, 24th contact of the multipled bank engaged by this wiper to positive pole of battery; also release relay RR3, wiper W3B first contact of the multipled contact engaged by this wiper to positive pole of battery. Relays BB3 and RR4 both energize in this circuit, and complete the following circuits: RR3 at contact 48, completes a circuit as follows: positive pole of battery, wiper W3B, contact 48, interrupter springs 49, magnet M3 to negative pole of battery. Magnet M3 is thereby energized and as it interrupts its own circuit and in view of the fact that the contact engaged by W313 are all multipled together except in a normal position, wipers W3A, W3B. W3C are all automatically stepped to normal position. When this occurs the energizing circuit for relay RR3 is broken at wiper W3B and releases. A similar result is brought about by relay RR4 which at contact 50 completes a circuit through the positive pole of battery, 24th multipled contact, wiper W4B, contact 50, interrupter springs 51, magnet M4. to negative pole of battery. Magnet- M4 thereupon operates to bring the wipers W4A, W413, W4C to a normal position, whereupon relay RR4 de-energizes. The energization of re-v lays RR3 and RR4 at contacts 42 and 43, opens the locking circuit for relay CORl, which accordingly de-energizes and hence everything at the control station has been restored to normal in readiness for the transmission of a fresh signal. It will be clear that the restoration of the keys depressed to normal either before or after an operation has taken place causes the switching to restore to normal in the same way as in the circuitdescribed as this circuit is not dependent upon the circuit completed by the key OK, relay QR4 which determines whether the operation is to be eilected or not being held up entirely under the control of the operating keys K1, K2, K3 at the control station.

It should be noted that a direct circuit'extends from lead 40 and lead 18 to any of the pairs of conductors C1, C2, C3. Consequently if it should be desired to take a meter reading or to take any other observation or perform any other operation which could be ef fected over two conductors from a distance in view of this circuit being a clean circuit this could be done by simply connecting a pair of leads similar to C1 to the apparatus which requires to be operated or observed.

It for example it was desired to ascertain the load upon conductors 1 and 2 of Fig. 1, of the Patent 7 42,681, issued to Laird, October 1903, the apparatus in the dotted square to the left of Fig. 1 of this patent would be connected across a pair of conductors, such as conductors 42 and 43A, while at the dispatchers ofiice the telephone D would be connected across the'conductors 40 and 18. In other words, conductors 40 and 18 would replace conductors 3 and 4 of the Laird patent. load upon the power leads land 2, the equipment would be stepped around so that wiper 3A of the switch RLS3 encounters the contactto which conductor 42 is connected, the

hen it was desired to ascertain the operating key OK would be momentarily depressed to start the mechanism in the dotted square A1 of Laird, and the impulses delivered by that mechanism would be audible in the receiver of the telephone. The operation of the key OK would correspond to the momentary closure of the switch E to connect the battery C across the leads 34 of Laird. Thus by way:=of example it will be seen how telemetering can be applied to the system of my invention.

A description will now be given of the manner inwhich the attendant at the control station is notified of the coming out of a circuit breaker. Associated with each circuit breaker is a air of contacts represented by CB1, CB2, C 3. If the circuit breaker CB1 corresponds to the breaker CB4 of Nelson, as

mentioned hereinbefore, spring set CB1 is a circuit: negative pole of battery, contact 53, 2

winding 0 relay 1R2, contact 54, positive pole of battery. Consequently when relay 0R2 energizes on the circuit breaker coming out, contact 54 is opened and the locking circuit for relay Hi2 opened, so that this relay the relay 1R2. falls back. Negative pole of battery, contact 58, contact 57, relay Q,R5, normal contact 59 of the bank contacts wiped over by wiper 5D of the rotary line switch RLS5, wiper V5D to positive pole of battery. Relay QR5 thereupon energizes and is locked energized over contact 66, while at contact 105 it completes a circuit for relay SR5 as follows: negative pole of battery, contact 101,wiper W2C of rotary line switch RLS2, normal contact 106, contact 105, normal contact 107, wiper W5B of rotary line switch RSL5, relay SR5, interrupter contact 60 to positive pole of battery. A branch of this circuit extendsover the left hand winding of cut-ofi relay COR2 to positive pole of battery. It will be appreciated that these circuits can only be completed when the rotary line switch RLS2 is at normal and relay GRl deenergized. Relay COR2 energizes and at contacts 27, 29 and 44 disconnects the leads 18A, 17A, respectively from the conductors 18B, 17 B, and the multipled lead connected toconductor 43, and connects leads 17A and 18A at contacts 68and69 to contacts controlled by relay QRG. Relay SR5 on energizing brings about'the following circuit changes: at contact 61 completes a circuit from negative pole of battery, magnet M5 to positive pole of battery, thereby energizing magnet M5. At contact 62 it prepares a point in a circuit which, however, is of no effect at this time, and at contact 63 it connects positive pole of bat tery through the normal contact 64 and wiper VV5A, relay QR6 to negative pole of battery. Relay QRG on energizing completes a circuit as follows positive pole of battery, contact 71, contact 68, lead 17A, polarized relay PR2, contact 45, wiper WVlB, normal contact 72 of rotary line switch RLSI, conductor 18A, contact 69. contact 83 to negative pole of battery. Relay PR2 energizes and closes the following circuit: negative pole of battery, contact 74; relay QR7 to positive pole of battery, relay QR7 energizes and brings about the following circuit changes: at contact 75 it completes a circuit for slow release relay SR7 as follows: negative pole of battery, contact 75, win-ding of relay SR7 to positive-pole of battery at contact 7 6 negative pole of battery is connected towiper WGA of the rotary line switch RLS6, at contact 77 negative pole of battery is connected to magnet M6, and thence to positive pole of battery: at contact 78 a circuit is completed from negative pole of battery, contact 78, left hand winding of relay LR-l to positive pole of battery, while a branch of this circuit extends through slow release relay SR8, to positive pole of battery.

Relay SR8 thereupon ener 'zes; relay LRl locks itselj energized in the ollowing circuit: negative pole of battery, contacts 79 of alarm bell key, contact 80 right hand winding of relay IaRl to positive pole of battery, while at contact 81 relay LR-l completes a circuit from negative pole of battery through circuit breaker alarm CBA through contact 81 to positive nole of battery, thereby sounding an alarm and calling the attention of the attendant at the main station that a circuit breaker has come out. Relay SR7 on energfzlng opens contacts 26 and 30 thereby breaking connection between conductors 17 and 18 and 17A and 18A, and connects conductorslSA and 17A at contacts 82 and 83 together by a circuit including the polarized relay PR3, and relay Q,R8. Relay PR3 does not energize at this time as it responds to current flowing in the opposite direction to that to which relay PR2 responds, Relay PR2, however, remains connected up in parallel to the series circuit including relays QRS and PR3. Relay QR8 energizes and completes a circuit for SR8 at contact 84 in parallel to that previously described over contact 78; while at contact 85 it completes a circuit for ma 'net M6 in parallel to that over contact 77.

Returning to the operation at the substation it will be remembered that magnet M5 had energized, the effect of this energization is to open the interrupter contacts 60, whereupon the relay SR5 de-energizes shortly after, which opens the circuit of magnet M5, thus permitting the wipers W5A, W5B, W5C,

W5D to advance one step. At the same time the circuit through QR6 is opened at contact 64 and the circuit extending over the conductors 17A and 18A is opened at contact 71, and at contact 83 thereby allowing relays PR2 and QRS to de-energizefwhereupon the circuit for magnet M6 is opened and the wipers of the rotary line switch RLS6 advance one step, thereby completing a locking circuit for relay SR7 as follows: positive pole of battery, winding of relay SR7, contact 86, wiper W6C, multipledcontacts 87 to negative pole of battery, so that this relay is maintained ens ergized as long as the wipers W6A, W613 W6C are in an off normal position. Relay SR8 being slow to release, remains energized as long as impulses are being transmitted. The closing of contact 60 when magnet M5 de-energizes at the substation causes the relay SR5 to again energize whereupon the current impulse in the opposite direction to that previously described is'transmitted over the conductors 18A and 17A. This circuit may be traced as follows: negative pole of battery, contact 62. contact 65,,contact 68, conduct-or 17A, contact 83, relay QRS, relay PR3, contact 82, conductor 18A, contact 69, contact 88. to positive pole of battery. Relay PR2 is also excited by this current in the branch cir-.

cuit previously traced, but only relay PR3 energizes with current in this direction. Relay QRS also energizes and gives another pulse over contact 85 to magnet M6. Shortly after relay SR deenergizes allowing the mag- 5 net M5 to release also QRS and PR3, consequently M6 releases and the wipers of the switches RLS5 and RLS6 advance a second step. If circuit breaker No. 1 was out at this instant, relay QR6 would energize over wiper W5A, third contact of bank contacts of relay 0R1 to positive pole of battery, but in the present description it will be assumed that it was in. .If' it was out the same conditions would arise up to a certain point as occurs when circuit breaker No. 2 comes out. The difference occurs if circuit breaker No. 1 has come out and been recorded prior to circuit breaker No. 2 coming out, in which case No.

1 of itself would be unable to initiate the transmission of signals again. The two switches thus operate in unison until the 5th contact 56 is reached by wiper W5A. When this occurs a circuit is completed for relay QR6 as follows: positive pole of battery, contact 55, contact 56, wiperW5A, relay QRG to negative pole of battery. Relay QRG energizes and opens contacts 88 and 65 closing contacts 73 and 71 thereby reversing the direction of current flow over the leads 18A and 17A. This reversal of current while still permitting the energization of QR8 and the consequent stepping of the wipers 76A, W6B, W6C also energizes relay PR2; the polarized relay PR2 energizes relay QR? which in turn completes the following circuit: negative pole of battery, contact 76, wiper WGA in fifth position, relay R12, to positive pole of battery. Relay R12 energizes and at contact 90 locks energized in the following cir- 49 cuit: negative pole of battery, contact 91, 7 contact 90, relay RI2 to positive pole of battery while at c0ntact 92 it opens the circuit of the red lamp RL2 which was lit indicating that the circuit breaker was in, thereby extinguishing'it and lighting a green lamp GL2 over contact 93. The generation of impulses continues, but no more signals will be given unless other circuit breakers have come out. If other circuit breakers should have come out, for instance circuit breaker 3, then when wiper W5A reaches the seventh contact, a circuit will be completed for relay QRG, over seventh contact 94, contact 95, to positive pole of battery. Reversal of current over the line will again take place, relay PR2 will be again energized and relay R13 would pull up, and also Show a green lamp. Relay QR5 would have its circuit opened at wi r W5D after the switch RLS5 had made its rst step. This relay would therefore de-energize and would not energize again unless another circuit breaker fell out in the meanwhile. If another circuit breaker fell out in the meanwhile, that iswhile the rotary line switch RLS5 was rotating, relay QR5 would receive a momentary impulse as previously described from the relays associated with the circuit breaker which has come out, and would lock up at contact 66 and W5D until a second revolution had begun and wiper \V5D stepped on to the second contact, and the effect of this relay locking up would be to ensure that the rotary line switch RLS5 would make a second revolution so as to repeat the signals just given, and ensure that a signal was given of the circuit breaker which has come out second, as it may be that when it came out the signalling position might have been passed. It

should be mentionedthat relays SR5 and COR2 after the first impulse were energized in a circuit over the multipled contacts wiped over by wiper W5B to negative pole of battery. 4

It will now be assumed that the circuit breaker QB2 is put in by the operator at the control station in the same manner as described in connection with the putting in of circuit breaker CB1. Inlthis case however instead of operating K1 the key K2 would be moved in an upwards direction. lVhen the circuit breaker CB2 is inserted, contact CB2 opens and relay 0R2 de-energizes, whereupon a circuit. becomes momentarily completed as follows: negative pole of battery, contact 102, contact 103, relay QR5, wiper 5D in normal position, contact 59, to positive pole of battery, so that the initias tion of the operation of the switches RLS5 and RLS6 is started as previously described: relay SR5, relay COR2 and relay QRG being operated also. The relay 0R2 upon de energizing completes a circuit for relay ORB as follows: positive pole of battery, contact 96, relay ORB, contact 97 to nega tive pole of battery. "Relay ORB energizes and completes a circuit for relay IR2 as follows: positive pole of battery. contact 54, relay 1R2, contact 98, to negative pole of battery. IR2 energizes and locks energized over the following circuit: negative pole of battery, contact 53, relay'IRQ, contact 54, positive pole of battery. and at contact 102 opens the momentary circuit previously described for starting the switch RLS5. At this time however when the wiper IV5A passes over the 5th contact, no circuit will be completed for the relay QRG. Conse- 'quently there will be no circuit for the relay R12, but a circuit will be completed for the relay RIB as follows: negative pole of bat tery, contact 89 (relay PR3 being energized) wiper 6B, 4th contact 99, relay RIB to positive pole of battery. Relay RIB energizes, opens the locking circuit of relay R12 thereby causing this relay to de-energize, which at contact 92 com letes a circuit for the red lamp RL2, the circuit of the green lamp GL being opened at 93. This change from a green to a red lamp indicates to the attendant that the circuit breaker has been 'il,814,52b

replaced. If the operator at the control station desired to have afcheck of the position of .the circuit breakers he can do this by, pressing a special key, not shown, so as to set the rotary line switch RLS3 on the 24th contact, whereupon a'circuit is established from lead 40 over contact 4L '(relayQR l being energized) wiper 3A, winding of relay (QR-9, contact 44 to lead 18A, so that by pressing the operating key relay Q,-R9 is energized in a similar manner to that described in the operation of putting in a circuit breaker. Relay QRQ on energizing completes a circuit over contact 103, relay (2R5 to the normal contact '59 of switch RLS5 as to setthe rotary line switches RLS5 and RLS6 in operation in the manner previously described. The full sequence of opera tions proceeds as previously described, and

the position of all the circuit breakers will be checked and reset if necessary, so as to indicate the actual condition of the circuit breakers at the substation to the attendant at the control station. It will thus be ap preciated that by means of the invention a very adequate-check has been provided to ensure that only the correct operation is performed, the selecting operation being checked, and subsequently there being a check that the correct operation has actually taken place, while further this can be checked under the control 'of the attendant at any time he desires and any circuit breaker coming out at the control station is immediately recorded at the main station and an alarm set in action which can only be restored to normal by operating the contact breaker alarm key 79 so as to release the relay LRI.

It will be noted thatthe invention as described ensures that when a selecting signal is being transmitted a circuit breaker coming out should pnly be able to take control of the line when the rotary line switches'have returnedto normal, as otherwise a false indication of the positions of the circuitbreakers may be given. ltis considered desirable to provide this safeguard although the operator can always check the indications by the arrangement shown.

The arrangement described possesses the advantage that the notification of a circuit breaker coming out always prevents the line being used for a selecting or operating signal and this is very important in practice.

In Fig. 6 a somewhat modified arrangement is shown by which the relay Q34 does not complete a localcircuit for the relay GRl at contact 106a, but completes a branch circuit between lead 40 and the lead 18A, which may be traced as follows: lead' 40, contact 41, conductor C7,rela-y GRl, (Fig. 5) conductor 18A. .By making this relay GRl of very high resistance as is possible with the voltage used, the efl'ect of this resistance will not in any way interfere with the operation of the -selected apparatus, and further will not'ma-- 18A and 40 does include the relay GRl, in

view of the high resistance of this relay and in view of the fact that'there is no battery or other local connection at the substation this does not interfere with the taking of meter readings, and for. all practical purposes the circuit is clean especially as the meter readings to be taken will all be read by means of comparatively low voltages.

' One advantage of this arrangement is that it enables a signal to be sent back to the central station ,ifa circuit breaker has been put in without necessarily requiring the restoration of the selecting key to normal. This 'may be a very important feature, particumg signal has been sent and before the operating key has been pressed.

In 5 another modification is shown by which three relays individual to each circuit breaker are avoided and replaced by brushes and contacts controlled by the circuit breaker itself. For this purpose a brush arm BAl is caused towipe over three segments SAl, SBl, SCI; when the circuit breaker No. .1 is in, SIM and S131 are connected together by the brush arm BAl thereby connecting negative pole of battery to the third contact wiped over by wiper W5A. Similarly circuit breakers Nos. 2 and 3 are provided with brush arms BA2 and BA3 and similar segments, SA2,SB2, SC2 and 3A3, SE3, SC3. The arrangement at each circuit breaker is identical, therefore it will only be necessary to consider circuit breaker No. 1. breaker comes out a circuit is momentarily completed for relay QR5 as follows: positive poleof battery, contact 59, wiper W51), relay (1R5, and a momentary connection betweensegment SCI and S131. QR5 therefore energizes and locks energized and the initiation of the operation of the signalling of the position of circuit breakers is brought about as before. There are one or-two slight alterations in the circuit of Fig. 5. For in stance the winding of relay QR6 is connected tive pole of battery, and accordingly the con- If a circuit.

to positive pole of battery instead of to neganectionsof contact 63 are connected to nega-' tive pole of battery, instead of positive.

This avoids having both positive and nega tive poles of battery connected to contacts of the same relay which is desirable if at all possible. There is another slight modification which however will be described later.

It will thus be seen that the coming out of a circuit breaker causes a momentary connection to energize relay Q35 which is similar to what takes place with the relays of Fig. 3 which they replace. When the circuit breaker is put in however, in addition to the momentary contact to cause relay Q,R5 to energize, which of course occurs, irrespective of the direction in which the brush arm BAI is moving, a circuit is permanently closed connecting negative pole of battery from segment SBI over brush arm BAI, segment SAI to the third contact wiper over by wiper W5A, so that exactly the same conditions are brought about as by the relays. It will therefore not be necessary to describe this operation further.

In addition, in Fig. 5 an arrangement is shown by which in the event of the attendant at the central station putting in a circuit breaker, he may receive a notification that he has ut it in even if it should come out immediately afterwards due to a short circuit, or excessive loading. This, it will be appreciated, is of considerable importance in practice as otherwise with the arrangements previously described, the attendant would have no assurance that the first putting in of the circuit breaker has resulted in the circuit breaker being put in and will not therefore be able to distinguish between the faulty operation of the selecting apparatus and the presence of a fault on the circuit controlled by the circuit breaker. For this purpose a relay is provided per circuit breaker which of course would be an extra relay in the case where three relays are provided instead of the brush arm arrangement. These relays are denoted by the references RBI, BB2, BB3. llhe operation is as follows: When a circuit breaker is put in a circuit is completed as follows: negative pole of battery, segment SBI, brush arm lBAl, segment SAI, relay RRI, contact 201 of rela GRI, to positive pole of battery. This is because relay GRI will be energized at this instant, as the o erating key will still be pressed. Relay R I therefore locks energized in the following circuit entirely independent of its original energizing circuit: negative pole of battery, contact 206, relay RBI, contact 202, contact 203 of relay QR5 to positive pole of battery.

Relay Q35 is of course energized as previously described in. the process of putting the circuit breaker in. Therefore each time a circuit breaker is put in, the relay RBI will be energized. and locked energized in a circuit independent of the operating key and of the brush arms on the contact breaker. The operating key can therefore be restored to normal without efl'ecting the relay RRI. In addition the relay RRI at contact 206 completes a circuit from negative pole of battery to the third contact wiped over by wiper W5A, so that even if the circuit breaker immediately comes out, an indication would be given as if the circuit breaker was in. Again a circuit is closed for an'auxiliary relay ARI which is common to all the circuit breakers. The auxiliary relay ARI operates and energizes a slow auxiliary relay SARI, at contact 204. Relay SARI energizes and prepares a circuit to the segments SCI, SC2, SC3. Relay Q,R5, as soon as relay GRI de-energizes, due to the operating key being restored to normal, causes the rotary line switch RLS5 to make a complete half revolution, thereby signalling the position of the circuit breakers to the attendant. In this case of course, the circuit breaker will indicate that it has been put in. After the first step rela-y QR5 will de-energize but the relay RBI will be maintained energized through contact 205 of relay COR2, which is in parallel with contact 203. Relay COR2 will of course de-energize when the wipers W5C reach the normal 0- sition. \Vhen this occurs relay RRI will eenergizetherebyremoving negative pole of battery from the third contact wiped over by wiper W'5A at contact 206, and opening contact 207 to permit relay ARI to de--energize. Relay ARI accordingly de-energizes and at contact 208 closes a circuit in series with contact 209 of relay SARI to cause relay QR5 to again ener ize, the circuit being completed over relay I 5, wiper W51), contact 59 to positive pole of battery. Relay QRS there upon causes the rotary line switch RLS5 to make a second revolution, but this time the signal to be given to the attendant will be reversed asregards circuit breaker No. '1, and the circuit breaker will be'indicated as having come out. Belay ARI having opened the circuit of relay SARI, contact 204, causes this relay to de-energize and open contact 209, so that the relays RBI, ARI, SARI have all returned to normal.

I claim:

I. In a remote control system, a supervisory switch having bank contacts and a normal position'foi" said switch in which it rests when not in use, and means for operating said switch, a switching device having a plurality of positions, a. position marking means on said device comprising three contacts, two of which are bridged by a wiper when it is in one position while the remaining contact and one of the first two are momentarily bridged when the wiper is moving to the other position, means including said first two contacts for marking the position of the switch in the banks of said supervisory switch, means controlled by said momentary bridging for starting said switch operating means to step said switch over its bank contacts, and means controlled by thesupervisory switch to indicate the position of the switching device.

2. In a remote control system, a control station and a substation, a trunk line between said stations, switching devices at said substation, selecting devices at said substation, means'for operating said selecting devices by 'impulsessent over said trunk line from said control station to select a switching device, supervisory devices at said control station, means for operating said supervisory devices by impulses sent over said trunk line from said substation, means for preventing the operation of saidsecond means while saidfirst means is operating, means for holding sai selectihg devices in an operated position, and means for operating said second means while said selecting devices are in said operated position.

3. In a remote control system, a control station and a substation, a trunk line between said stations, switching devices at said substation, selecting devices at said substation, mean. foroperating said selecting devices by impulses sent over said trunk line from said control station to-select a switching device, supervisory devices at said control station, means for operating said supervisory devices by impulses sent over'said trunk line from said substation, means for preventing the operation of said second means while said first means is operating, means for holding said selecting devices in an operated position, means for operating said selected switching device, and means for preventing the operation of said second means while said selecting and operating means are operating and means for operating said second means while said holding means is efiective.

4:. In a remote control system, a dispatchers station comprisingm manually controlled sender and a supervisory switch, a substation comprising selecting devices and an automatic sender, an imp-ulsing circuit between said stations, means including said manually controlled sender for operating said selecting devices over said impulsing circuit, means for holding said devices in their respective operated positions, means for preventing the operation of said automatic sender while said manually controlled sender is operating,

- means for operating said automatic sender while said holding means is effective, and means for operating said supervisory switch over said impulsingcircuit responsive to the operation of said automatic sender.

5. In a remote control system, a plurality of multi-position switching devices, means to 5" moving said devices from one position to another, a supervisory switch associated with said devices having a normal position, bank contacts on said switch, means including a group of contacts on each of said devices two of which are bridged Whenthe device 1s 1n a certain position for marlnng that posltion bridged when that device changes position for energizing said start relay, means for locking said start relay energized independently of,

said momentarily bridged contacts, means .controlled by said start relay for stepping said switch out of its normal position over its bank contacts, means for breaking said locking circuit by said switch stepping out of its normal position, and means controlled through the banks of said switch as it is stepped over its banks for indicating the positions occupied by said devices.

g 6. In a remote control system wherein circuit closing devices are manuallyoperated from a distance to their closed positions and are automatically tripped to their open positions in response to circuit conditions, a supervisory contact for each of said devices, means on each of said devices for placing a potential on its corresponding supervisory contact when the device is in its closed position and for disconnecting such potential therefrom when said device is moved to its open position, a relay energized responsive,

to the operation of one of said devices from its open to its closed-position for connecting a like potential on the corresponding supervisory cont-act, means for maintaining said relay energized irrespective of the position of said device, supervisory devices for indicating at a distance the position of said devices, means for operating said supervisory devices in accordance with the potential connected to said supervisory contacts, automatic'means for thereafter deenergizing said relay to disconnect the said like potential from said supervisory contact, and means'common to said circuit-closing devices and operated responsive to the deenergizat-ion of, said relay for reoperating said supervisory devices to again check and indicate the position of said circuit-closing devices.

7. In a remote control system wherein circuit-closing devices are manually controlled from a distance to be operated to their closed positions and are automatically tripped to their open position in response to circuit cond1t1ons, a supervisory switch having a normal my name this vices for indicating an a distance the occu pied position of said devices, means responsive to the operation of said circuit-closing device to step said switch from its normal position over said supervisory contacts and back to its normal position, means responsive thereto for operating the supervisory devices in accordance with the potential connected to said supervisory contacts, means responsive to said switch reaching its normal position for opening said locking circuit to deenergize said relay to disconnect the maintained like potential from said supervisory contact, means common to .said circuit-closing devices responsive to the deenergization of said relay for reoperating said switch, and said supervisory devices reoperated in accordance with the potential connected to said supervisory contact to again check and indicate the positions of the circuit-closing devices.

In witness whereof, I hereunto subscribe 22d day of April, A. D. 1926. CHARLES REMINGTON. 

